[mythtv] BUG: Alsa and surround sound

[John Hurliman]

Are you using SPDIF output (digital) for surround sound or running 
multiple 1/8" jacks (analog) to each of the speakers? All channels in 
SPDIF are controlled by the IEC958 Playback mixer in alsamixer, for 
analog 4.1 each channel has it's own mixer control and the PCM volume or 
Master volume that Mythtv controls only affects some, most likely the 
front channels. If you are using SPDIF I'd recommend adjusting your 
volume only through the external amplifier, in the analog case it's a 
bit tricker. Myth would have to probe the soundcard for surround 
channels, and adjust the volume of those too if found. It can be done, 
but I don't have the patch ;).

jph

Michael J. Pedersen wrote:

>PC Information: Debian Gnu/Linux (unstable)
>Sound Card: SB 128 PCI, using ALSA 0.9
>MythTV Info: version 0.9
>Reproducibility: Always
>
>Description:
>This one is more suited to description than to steps. When adjusting the
>volume on a system with 4.1 surround sound, the rear channel never has
>its volume adjusted at all. It ALWAYS remains at a constant level, even
>when I hit mute. This might be more of an ALSA bug, but I figured I'd
>bounce it off the folks here first, since MythTV is where/how I notice
>it.
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